using System;
using Server.Mobiles;
using Server.Targeting;

namespace Server.Spells.Necromancy
{
  public class VengefulSpiritSpell : NecromancerSpell, ISpellTargetingMobile
  {
    private static SpellInfo m_Info = new SpellInfo(
      "Vengeful Spirit", "Kal Xen Bal Beh",
      203,
      9031,
      Reagent.BatWing,
      Reagent.GraveDust,
      Reagent.PigIron
    );

    public VengefulSpiritSpell(Mobile caster, Item scroll = null) : base(caster, scroll, m_Info)
    {
    }

    public override TimeSpan CastDelayBase => TimeSpan.FromSeconds(2.0);

    public override double RequiredSkill => 80.0;
    public override int RequiredMana => 41;

    public override void OnCast()
    {
      Caster.Target = new SpellTargetMobile(this, TargetFlags.Harmful, Core.ML ? 10 : 12);
    }

    public override bool CheckCast()
    {
      if (!base.CheckCast())
        return false;

      if (Caster.Followers + 3 > Caster.FollowersMax)
      {
        Caster.SendLocalizedMessage(1049645); // You have too many followers to summon that creature.
        return false;
      }

      return true;
    }

    public void Target(Mobile m)
    {
      if (m == null)
        return;

      if (Caster == m)
        Caster.SendLocalizedMessage(1061832); // You cannot exact vengeance on yourself.
      else if (CheckHSequence(m))
      {
        SpellHelper.Turn(Caster, m);

        /* Summons a Revenant which haunts the target until either the target or the Revenant is dead.
         * Revenants have the ability to track down their targets wherever they may travel.
         * A Revenant's strength is determined by the Necromancy and Spirit Speak skills of the Caster.
         * The effect lasts for ((Spirit Speak skill level * 80) / 120) + 10 seconds.
         */

        TimeSpan duration = TimeSpan.FromSeconds(GetDamageSkill(Caster) * 80 / 120 + 10);

        Revenant rev = new Revenant(Caster, m, duration);

        if (BaseCreature.Summon(rev, false, Caster, m.Location, 0x81,
          TimeSpan.FromSeconds(duration.TotalSeconds + 2.0)))
          rev.FixedParticles(0x373A, 1, 15, 9909, EffectLayer.Waist);
      }

      FinishSequence();
    }
  }
}